Foolishly infatuated (8)
I believe the answer is:
besotted
'foolishly infatuated' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for besotted that I've seen before include "Bested to become infatuated" , "Infatuated - so betted accordingly" , "Head over heels in love" , "Stupefied by infatuation" , "Foolishly infatuated" .)